Cutting-tool



G.v H. GILMAN.

CUTTING TOOL.

APPLICATION FILED JULY24, I919.

@atenited June 2&

UNITED STATES PATENT OFFICE.

- GEORGE H. GILMAN, F CLAREMONCE, NEW HAMPSHIRE, ASSIGNOR T0 SULLIVAN MACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS.

comma-moon Specification of Letters Patent.

Patented June 28, 1921.

Original application filed April 3, 1913, Serial No. 758,563. Renewed December 7, 1914, Serial No.

876,004. Divided and this application filed July 24, 1919.

' T 0 all whom it may concern Be it known that T, Gnoncn H. GILMAN, a citizen of the United States, residing at Claremont, in the county of Sullivan and State of New Hampshire, have invented certain new and useful Improvements-in Cut-' ting-Tools, of which the following is av full, clear, and exact specification.

This invention relates to cutting tools, and

lowing description of one form or embodiment thereof illustrated in the aceompanying drawings, while itsscope will be more particularly pointed out in the claims hereunto appended.

In these drawings,-

Figure 1 is a transverse sectional view, taken substantially on the line 1-1, Fig. 2, of a rock drilling machine embodying the invention.

Fig. 2 is a central longitudinal section taken substantially on the line 22, Fig. 1.

Fig. 3 is a detail sectional view taken substantially on the line 33, Fig. 1.

Referring to the drawings, the invention is, for illustrative purposes, therein shown as embodied in a mounted rock drilling 1nachine of the indirect or hammer type, but

it will be distinctly understood that many of the features of the invention are applicable to machines of other types.

In the construction shown, 15 is a cylinder mounted upon the usual shell 16 and adapted to be fed toward or from the work by means of a feeding screw 18. Working in the cylinder 15 is a hammer piston 20 adapted to deliver blows upon the inner end or shank of a suitable drill bit 23, said drill bit being hollow and comprising a suitable piece of steel provided with a fluid supply passage 25 extending therethroughfrom end to end. As shown, the drill bit is provided with a plurality of lugs 26 by means-inf which-it is held against rotative movement Serial No. 313,120.

with respect to, but permitted to move l0ngitudinally within, a suitable holding device or chuck, herein shown as comprising a .rotatable sleeve 27. Any suitable means, either manual or automatic, may be employed for rotating the drill bit, and suitable valve mechanism may be provided for controlling the flow. of, pressure fluid to and from the opposite endsof the cylinder to cause reciprocation of the piston. The distributing valve controls the admission of pressure fluid to opposite ends of the cylinder from a pressure fluid supply space 30, to which steam or other gaseous fluid, but preferably compressed air, is supplied by a flexible pipe 32 under the control of a throttle valve 48.

The drill bit rotating means and the distributing valve, however, form no portion of the present invention and are not illustrated herein as they may be of any usual construction well known in the art, I

To supply the hollow drill bit with liquid and gaseous fluid under pressure, there is provided a supply tube 66 projecting loosely at its forward end into the bore of the drill bit and having its rear end extending into a cliamber 36 formed in a rear cylinder head or head block 37. The piston 20 is formed with an axial opening through which the tube 66 passes and reciprocates upon said tube with a sliding fit, so that no pressure fluid, or no substantial amount thereof, can pass through said axial opening from one end of the cylinder to the other. The rear end of the supply tube 66 is encircled by a suitable packing ring 67 held under compression against the circumferential wall of the tube by a gland comprising a sleeve or bushing 68 in threaded engagement with the wall of the recess 36 in the head block 37,

thereby clamping said tube in place in said head block. Into the rear end of the chamber 36 is inserted a plug or nipple 39 having suitable provision for introducing water or other liquid into: the supply tube, such water being herein supplied under pressure from any suitable source by means of a flexible pipe 40 under the control of suitable means hereinafter described. The nipple 39 is provided with a tube or tubular extension 41 which projects coaxially into the rear end of the supply tube 66, but which does not lit the bore of said supply tube but is held spaced therefrom by the nipple 39 to provide an annular space 42 communicating with the interior of the sleeve or bushing 68 in the chamber 36. This chamber is connected by an annular groove 43 to a gaseous fluid supply port 44. The nipple 39 is provided with an axial passage 45 having communication, through a passage 46, with a port 47. During the operation of the. tool, water may be admitted through the passage 45, said water passing centrally through the supply tube 66 and being united with the live air or other pressure fluid which enters the tube about the tubular extension 41 of the nipple. The relation of the tubular extension to the supply tube is preferably such as to provide for a siphoning or ejector action, and the gaseous fluid and water, passing downwardly from the tube, are delivered to the bottom of the drilled hole through the hollow drill steel.

In order that the supply of motive fluid to the cylinder, the supply of liquid to the drilled hole, and the supply of gaseous fluid to the drilled hole may be coordinately controlled, they are all preferably placed under the control of the single valve 48 which, in its closed position, shuts off entirely the supply of gaseous fluid and liquid from the tool, but which may be operated in such a manner as first to admit gaseous fluid to the drill bit, then to admit liquid to the drill bit while maintaining the supply of gaseous fluid, and finally to admit actuating fluid to the cylinder while still maintaining the supplies of gaseous fluid and liquid to the drill bit. This will insure the operator against IQIIIOY- ing the drill steel from the machine before the hole is properly cleaned of its cuttings, and will also reduce the work of changing the drill steel, inasmuch as the operator will not have to shut off the liquid and gaseous fluid in two separate operations.

To these ends the throttle valve 48 is provided with an interior chamber 49 communicating at all times with the air pi )e line 32 through a suitable coupling 50, while the valve receives its supply of water from the water pipe line 40 through a suitable coupling 51. The couplings 50 and 51 are herein shown in the form of elbows having tapered terminal portions 52 and 53, respectively, seated. in correspondingly tapered bushings 54 and 54' threaded into the head block 37. The swiveled coupling 50 is held seated in its bushing by a suitable spring 55 hearing at one end against the inner end of thelthrottle valve 48, the latter being also tapered, and the spring thus serving to assist the fluid pressure in keeping the valve firmly seated in its chamber in the head block. In a similar manner the swiveled coupling 51 is held seated in its bushing 54' by a suitable spring 56 bearing at one end against the inner end of a water supply chamber 57 in which the spring is placed. Leading from the chamber 57 is a passage or port 58 which may be placed in communication with the port 47 by means of an arcuate groove 59 formed in the periphery of the valve 48. When the latter is closed, as shown in Fig. 2, the supply of water to the supply tube 66 is shut off, but when the valve is turned by means of a suitable handle 60, into the positionshown in Fig. 3, the groove 59 serves to place the port 58 in communication with the port 47, thus admittingwater to the supply tube. The valve 48 is provided with a port 61 leading from its interior chamber 49, and this port may be placed in communication with the pressure fluid supply space 30 to supply actuating fluid to the cylinder and the tool. A port 62 also leading from the interior chamber 49 in the valve, and incidentally communicating with the port 61, is provided to establish communication between the pressure fluid supply space within the valve and the port 44 to admit gaseous fluid to the supply tube 66.

The groove '59 and ports 61 and 62 are so related to one another that byturning the valve in a counter-clockwise direction from the position shown in Fig; 2, pressure fluid is position to connect the ports 47 and 58, as

shown in Fig. 3, so as to admit liquid to the supply tube. When the valve is turned still farther, pressure fluid is admitted to the supply space 30 and thence to the cylinder, whilethe supply of pressure fluid and liquid to the supply tube are still maintained. The valve may be closed by a reversal of the foregoing operations, there-by shutting off first the supply of pressure fluid to the cylinder, then the liquid supply, and finrlly thesupply of gaseous fluid to the tu e. In my improved construction it will thus be observed that a supply of liquid may be delivered to the tube, andv a supply of gaseous fluid may be delivered to the tube, so that the tubes may causethe-desired mixture to be delivered to the drill steel, although it will be understood that other forms'of controlling mechanism may be utilized for this purpose. It will also be noted that in my improved construction by removin the nipple or plug 39, the bushing 68, pacTrins ring 67, and supply tube 66 may be all with rawn through the opening in the rear end of the head block 37, for purposes of repair or otherwise, Without removing said head block or otherwise disassembling the apparatus.

While I have in this application specifi cally described one form which my invention may assume'in practice, it willbe understood that this embodiment is shown for illustrative purposes and that the invention.

may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a rock drill, a rear head, a hollow drill steel, and means for supplying a cleansing fluid to said drill steel comprising a chamber in said head, a gland insertible in said chamber, retaining means between a wall of said chamber and a wall of said gland, and a plurality of detachable fluid conducting means one of which is secured in said head by said gland and retaining means.

2. In a rock drill, a rear head, a hollow drill steel, and means for supplying a cleansing fluid to said drill steel comprising a chamber in said head, a gland insertible in said chamber, retaining means between a wall of said chamber and a wall of said gland. anda plurality of fluid conducting tubes one of which is detachably secured in said head by said gland and retaining means, said gland and head having provision for conducting a separate supply of cleansing fluid to each of said tubes.

3. In a rock drill, the combination with a cylinder, of percussive means therein, a hollow drill steel, a rear head, a plurality of coaxially disposed tubular gaseous fluid and liquid conducting means mounted at their rear ends i said rear head, means between the rear ends of said conducting means cooperating with one of them to secure it in said head, and a coaxially apertured securing member removable through said rear head.

4. In a rock drill. the combination with a rear cylinder head, of a plurality. of coaxially disposed gaseous fluid and liquid conducting tubes in said head, means for securing one of said tubes in position in said head comprising a member having a passage communicating with one of said tubes, and a second tube securing member having a passage communicating with the other thereof.

5. In a rock drill, the combination with a rear cylinder head, of a plurality of coaxially disposed gaseous fluid and liquid conducting tubes extending into the same, means for securing one of said tubes in position in said head comprising a member having a passage communlcating with one of said tubes, a second securing means having a passage communicating with the other thereof, and a single valve controlling the flow through each of said passages.

6. In a rock drill, the combination with a cylinder, of percussive means therein, a hollow drill steel, a rear head, a plurality of coaxially disposed gaseous fluid and liquid conducting means disposed coaxially with said piston and mounted in said rear head, securing means having a passageleading to one of the same. and a coaxially disposed member for holding the other of said conducting means in position and having a pasa e leading thereto.

In a rock drill, the combination with a cylinder, of percussive means therein, a hollow drill steel, a rear head, a plurality of coaxially disposed gaseous fluid and liquid conducting means disposed coaxially of said piston. means between the same for centering one of said means in said rear head and removable through said head, and a member for holding one of said tubes in position axially alined therewith and likewise removable through said head.

8. In a rock drill. a cylinder. an axially apertured rear head therefor, an axially apertured pistonin said cylinder. a plug closing the aperture in said rear head, a plurality of concentric tubes extending into the aperture in said head and disposed coaxially with said plug and the aperture in said piston and removable rearwardly through the aperture in said rear head upon removal of said plug, and means including a passage through said plug for supplying fluid to one of said tubes.

9. In a rock drill, a cylinder, an axially apertured rear head therefor, an axially apertured piston in said cylinder, a plug closing the aperture in said rear head, a plurality of concentric tubes disposed coaxially with said plug and the aperture in said piston and removable through the aperture in said rear head upon removal of said plu and means including a valve and passages in said head and plug controlled by said valve for supplying pressure fluid to one and liquid to the other of said tubes.

10. In a rock drill, a cylinder. an axially aperturd rear head therefor, an axially apertured piston in said cylinder, a plug closin, the aperture in said head. a plurality of tubes disposed coaxially with said plug and the aperture in said piston and removable through the aperture in said head upon removal of said plug, and means including a single valve and separate passages controlled by said valve and formed in said head and said head and plug respectively for supplying pressure fluid to one and liquid to the other of said tubes.

11. In a rock drill, a cylinder. an axially apertured rear head therefor, an axially apertured piston in said cylinder, a tube ex tending into the apertures in said piston and head, a sleeve on the end of said tube disposed in the aperture in said head, an axially disposed cooperating tube extending into the aperture in said head and into said first named tube, said tubes being removable rearwardly through the aperture in said head, and a plug normally closing the aperture in said head.

12. In a rock drill, a cylinder, an axially apertured'rear head therefor, an axially'apertured piston in saidcylinder, a tube extending into the apertures in said piston and head, a sleeve on the end of said tube disposed in the aperture in said head, an axially disposed cooperating tube extending into the aperture in said head and into said first named tube, said tubes being removable rearwardly through the aperture in said head, a plug normally closing the aperture in said head, and means including passages through said head and plug for supplying separate supplies of cleansing fluid to said tubes.

13. In a rock drill, a cylinder, an axially apertured rear head therefor, an axially apertured piston in said cylinder, a tube extending into the apertures in said piston and said rear head, a short coaxially disposed cooperating mixing tube disposed in the aperture in said head and opening directly into the rear end of said first mentioned tube, and means for-suplying separate supplies of pressure fluid and liquid to said tubes. 1

14. In a rock drill, a cylinder, an axiallyapertured rear head therefor, an axially ap-.

ertured piston in said cylinder, a tube extend ing into the apertures in said piston and said rear head, a short coaxially disposed cooperating mixing tube disposed in the aperture in said head and opening into the rear end of said tube, means for supplying separate supplies of pressure fluid and liquid to said tubes, and means for removing said tubes rearwardly through the aperture in said head.

15. In a rock drill, the combination with a cylinder, a piston therein and a hollow drill steel, of separate coaxially disposed gaseous fluid and liquid conducting tubes mounted in said cylinder to conduct cleansing fluid for said steel, and removable means for holding said tubes in spaced relation in said cylinder.

16. In a rock drill, the combination with a cylinder, a rear head therefor, a piston in said cylinder, and a hollow drillsteel,-of separate coaxially disposed gaseous fluid and liquid conducting tubes to conduct cleansing fluid for said steel, and independent means in said rear head for holding said tubes in spaced relation.

17. In a rock drill, the combination with I a cylinder. a rear head therefor, percussive means in said cyllnder, and a hollow drill steel, of separate coaxially disposed gaseous fluid and liquid conducting tubes to conduct cleansing fluid for said steel, and means for fluid and liquid conducting tubes to conductcleansing fluid to said steel, and a clamping member disposed in said head into one end of which one of said tubes partially projects and through the opposite end of which a portion of said other tube projects.

19. In a rock drill, the combination with a cylinder, a rear head therefor, percussive means in said cylinder, and a hollow drill steel, of separate coaxially disposed gaseous fluid and liquid conducting tubes to conduct cleansing fluid for said steel, means for clamping the outer one of said tubes in said rear head comprising a member surrounding the same and extending rearwardly therefrom, and means for holding the inner one of said tubes in said rear head located to the rear of said clamping means.

20. In a rock drill, the combination with a cylinder having a. rear head, percussive means therein and .a hollow drill steel, of separate coaxially disposed gaseous fluid and liquid conducting tubes to conduct cleansing fluid for said steel, said tubes being mounted in the rear head of said cylinder and removable longitudinally rearwardly therethrough. Y

21. In a rock drill, the combination with a cylinder having a rear head, percussive means therein and a hollow drill steel, of separate coaxially disposed gaseous fluid and liquid conducting tubes to conduct cleansing fluid for said steel, said tubes beinginounted in the rear head of said .cylinder and removable longitudinally rearwardly therethrough, and means removable through the rear head of said cylinder for holding said tubes in position.

92. In a rock drill, the combination with a cylinder, a hollow drill steel and means carried by the cylinder and adapted to contact with the steel to deliver a blow thereto, of a plurality of cleansing fluid conducting means passing centrally through said cylinder, one of said conducting means terminating in the drill steel, and another of said conducting means terminating short of the end of said drill steel.

23. In a rock drill, the combination with a cylinder, a piston therein and a hollow drill steel, of se arate coaxially disposed gaseous fluid and iquid conducting tubes to conduct cleansing fluid for said steel, said cylinder comprising a rear head in which said tubes are mounted,a packing surrounding one of said tubes, a member operative when said parts are in assembled relation to compress said packing, said member being provided with means for conducting fluid pressure to one of said tubes, and means co- 24. In a rock drill, the combination with a cylinder, a piston therein and a hollow drill steel, of means for supplying cleansing medium to the drill steel comprising a rear head for said cylinder provided with a chamber therein, a conducting tube projecting into said chamber andextending longitudinally through said cylinder, a packing surrounding said tube and disposed in said head, a gland surrounding said tube and operative to compress said packing to hold said tube in fixed relation to said head, and

a second tube mounted in said head to the rear of said first mentioned tube and projecting thereinto.

25. In a rock drill, the combination with a cylinder, a piston therein and a hollow drill steel, of means for supplying cleansing medium to a drill steel comprising a rear head for said cylinder provided with a chamber therein, a conducting tube projecting into said chamber and extending longitudinally through said cylinder, a packing surrounding said tube and disposed in said head, a gland surrounding said tube and operative to compress said packing tohold said tube in fixed relation to said head, said gland being provided with means for supplying cleansing fiuid to said tube, and a second tube mounted in said head to the rear of said first mentioned tube and projecting into the latter.

26. In a rock drill, the combination with a cylinder having a rear'head, percussive means in said cylinder, and a hollow drill steel, of separate coaxially disposed gaseous fluid and liquid conducting tubes to conduct cleansing fluid for said steel, and removable means disposed in said rear head for maintainin said tubes in fixed'spaced relation.

27. n a rock drill, the combination. with a cylinder having a rear head, percussive means in said cylinder, and a hollow drill steel, of separate coaxially disposed gaseous fluid and liquid conducting tubes to supply cleansing fluid to said steel, means disposed in said head and distinct therefrom into which one end of one of said tubes projects and which coiiperates to maintain said tube in fixed relation to said cylinder, and means disposed to the rear of said first mentioned means for maintaining the other of said tubes in coaxial relation therewith.

28. In a rock drill, the combination. with. a cylinder having a rear head, percussive means in said cylinder, and a hollow drill steel, of separate coaxially disposed gaseous fluid and liquid conl cting tubes to supply cleansing fluid to said steel, means disposed in said rear head and detachable therefrom into which one end oi one of said tubes projects and which is operative to maintain said tube in fixed relation to said cylinder, and removable means disposed to the rear of said first mentioned means and cooperating to support the other of said tubes within said first tube.

29. in a rock drill, in combination, a head block, a throat piece therein, a fluid supply tube having its end in'said throat piece, and a nozzle having its end adjacent the end of said tube, said throat piece, tube, and nozzle being normally fixed but separable with respect to said head bloc and each other.

30. in a rock drill, in combination, a recessed head block, a fluid supply tube communicating with the recess in said head block, and a nozzle haviin its end adjacent the end of said tube, said tube and nozzle being normally fixed but relatively adjustable.

In testimony whereof li affix my signature.

GliLMAN. 

